Hand-press for making metal caps.



No. 650,467. Patented AMay-29, |900.

G. F. KRIEGEI.v

HAND PRESS FOR MAKING METAL GAPS.

(Application led Feb. 23, 1900.)

( No Model.)

*Jag/1 Umts-p STATEsj PATENT OFFICE.

stoner. F. namens., or cnicnc'o, Hamers, Assiettes or ONE-THIRD To ADIE B. HORN, OF SAME PLACE.

HAND-PRESS FOR MAKING METAL CAPS.

SPECIFICATION forming' part of Letters Patent No. 650,467, dated Vay 29, 1900.

Application liled February 23, 1900. Serial No. 6,252. (No model.)

T @ZZ whom t may concern:

Be it known that I, GEORGE F. KRIEGER, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hand-Presses for Making Metal Gaps, ot which the followingis a specification.

My invention relates particularly to means for making blank caps from which dental cap-crowns are afterward formed.

The main object of myinvention is to provide a device of simple and comparativelyinexpensive construction which may be conveniently used by dentists in making dental cap-crowns.

The further objects of the different parts with which I put my invention into practice kwill be understood from the following description, with reference to the accompanying drawings, in which Figure 1 is a vertical section of the lower part of a device constructed accordingto my invention, showing sanie held by the jaws of a vise and illustrating the position of the parts preparatory to forming a metal cap. Fig. 2 is the same View with the upper parts attached, showing the differents steps in the process of forming the cap. Fig. 3 is the saine view, showing the position of the parts when the cap is completed and having the base of the device turned at right angles to its former position to show the lugs whereby said base is secured in the vise. Fig. 4 is a section of the cap after the first step in the process of making same. Fig. 5 is a section of the complete cap. Fig. 6 is a plan of a wrench used in connection with the device shown in the other iigures.

The device shown consists of a hollow base, a pair of cones fitting in the same, a sleeve threaded upon said base, a screw-cap threaded upon said sleeve, a screw threaded in said cap, and a plunger loosely seated at the lower end of said screw.

The base 1 is exteriorly threaded at 2 and has a shoulder 3 for supporting the cone 4. Said cone has a seat 25 with an annular groove 5 therein for receiving the disk 6, from which the cap is afterward formed. The cone 7 is vertically slidable in the base l. Each of said cones has'a central aperture of slightlygreater diameter than the plunger 8. The plunger S is vertically slidable in the sleeve 9. Said sleeve has a shoulder 25, which rests 5 5 on the cone 7 when the sleeve 9 is screwed down for the purpose of pressing the cone 7 upon the disk 6. The cap 10 is threaded upon the upper end of the sleeve 9 and has a central threaded aperture for receiving the 6o screw 11. Said screw has a circular aperture 12 at its lower end for receiving the pin 13 of the plunger 8. The head 14 of the screw 1l is rigid thereon and has an aperture for receiving the rod 15. Said rod is tight- `ened in said aperture by the set-screw 16.

The outer end of the rod is bent upwardly at 17, serving as a handle for the operator in turning the screw 1l. The base l is provided with lugs 18, whereby the same maybe 7o secured in the vise-jaws 19. The sleeve 9 is provided with an aperture 20, serving as a seat for the pin 21 of the wrench 22. The screw-.head 10 is provided with a similar apertulre 23 for receiving the pin 24 of said 75 wrench.

The cones 4 and 7 are made removable, so

that other cones with central apertures of a different size may be substituted for making caps of different sizes. Aturther advantage 8o of using the cone 4 instead of making the seat 25 integral with the base 1 is that said cone 4 may be stamped out'of sheet-steel and readily7 tempered.

The operation of the device is as follows: A disk 6 is tlrst seated in the groove 5 of the cone 4 in the position shown in Fig. 1. The cone 7 is then placed upon the disk 6, and the sleeve 9 is screwed down upon same to the position shown in Fig. 1. The wrench is then 9o applied by inserting the pin 21 in the aperture 20. The operator then screws the sleeve down by means of said wrench until the cone 7 is pressed down upon the disk 6 toits lower limit, as shown in Fig. 2. He will then insert the plunger S, allowing same to drop to the position shown in Fig. 2. The screw-cap 10 will then be screwed down upon the sleeve 9,

and the screw 11 will be turned in said cap until the same engages the plunger S, as leo shown in Fig. 2. The operator will now continue to turn said screw by means of the rod 15 until the plunger forces the disk into the form and position shown in Fig. 3. Said plunger and cap will 110W drop through the lower end of the base 1. The screw-cap 10 and screw ll may be first attached together in about the relation shown in Fig. 2 before said screw-cap is attached to the sleeve 9. The operator may then usc the wrench 22 in tightening said screw-cap upon the sleeve 9, and thus bring the screw 1l down upon the plunger 8.

It will be understood that minor details of the device shown may bealtered in numerous Ways Without departing from the spirit of my invention. myself to such details, except as hereinafter limited in the claims.

. What I claim as my invention, and desire to secure by Letters Patent, is

l. In a press for making metal caps, the combination of a hollow base, having a conical apertured seat therein,an apertu red cone vertically slidable in said base and formed to register with said seat, a member engaging said base for forcing said cone upon the seat and locking same thereon, and a plunger vcrtically slidable through the apertures in said cone and seat, substantially as described.

2. In a press for making metal caps, the combination of a hollow base, having a conical apertured seat therein, an apertured cone vertically slidable in said base and formed to register with said seat, a sleeve threaded upon Said base and having a shoulder for bearing upon said cone, and a plunger vertically slidable through the apertures in said conc and seat, substantially as described.

3. In a press for making metal caps, the combination of a hollow base, having a conical apertu red seat therein, an apertured cone vertically slidable in said base and formed to register with said seat, a sleeve threaded upon said base and having a shoulder for bearing upon said cone, a screw threaded in said sleeve, and a plunger vertically slidable I therefore do not confine' through the apertures in said cone and seat, adapted to be forced downward by said screw, substantially as described.

4E. In a press for making metal caps, the combination of a hollow base, having a conical apertured seat therein, an apertured cone vertically slidable in said base and formed to register with said seat, a sleeve threaded upon said base and having a shoulder for bearing upon said cone, a screw-cap threaded upon said sleeve and having a threaded aperture in its top, a screw seated in said threaded aperture, and a plunger vertically slidable through the apertures in said cone and conical seat and adapted to be forced downwardly by said screw, substantially as described.

5. In a press for making metal caps, the combination of a hollow base, having a conical apertured seat therein, with an annular groove in the face of said seat and surrounding the aperture therein, an apertured cone vertically slidable in said base and formed to register with said seat, a member engaging said base for forcing said cone upon the seat and locking same thereon, and a plunger vertically slidable through the apertures in said cone and seat, substantially as described.

G. In a press for making metal caps, the combination of a hollow base, an apcrtured member removably seated in said base and having a conical apertured seat therein, an apertured cone vertically slidable in and removable froxn the base and formed to register with said seat, a member engaging said base for forcing said cone upon the seat and locking same thereon, and a plunger vertically slidable throughthe apertures in said cone and seat, substantially as described.

Signed by me at Chicago, Illinois, this 21st day of February, 1900.

GEORGE F. KRIEGER.

Witnesses:

WM. R. RUMMLER, GLEN C. STEPHENS. 

